Improved expanding- drill



nited iatwa JEREMIAH L. SAYLES, OF GLOUCESTER. RHODE ISLAND.

Letters. Patent No. 85,334, dated December 29, 1868.

To all whom it may concern:

Be it known that LJEREMI'AH L. SArLEs, ofG-loucester,'in the county of Providence, and State of Rhode Island, have invented a new and improved Expanding Drill; and I do hereby declare that the following specication, taken in connection with the drawings, making a part of the same, is a full, clear, and exact de` scription thereof.

Figure l is a view of my improved drill.

Figure 2 is a view of the same, with one of the cutters removed.

Figure 3 is a view of one of the cutters detached, showing the under side.

Figure 4 is an end view.

The object of my invention is to produce an expanding drill, which shall be simple in its construction, easy of adjustment, and which, for durability, and in cost of manufacture, shall be superior to others now in use.

The chief' objections to expanding' drills are, first, their great expense; and, second, their want of durability, which, by reason of their complicated construction, they do not possess. These objections Ilhave endeavored to overcome in my drill, which I will now proceed. to describe.

A is a piece of metal, Inadein proper shape, and mortised near the end, for the purpose of receiving a slide, D, fig. 2, having, upon each side, au inclined tongue, c, ,and is drawn backward and forward within the mortise by means of a screw, b. v

Upon each side of the piece of metal A, cutters B and B are slightly let in, and are held in place by screws, each cutter having, upon its inner surface, au

inclined groove, c, which receives the tongue upon the -slide D.

The drill may be adjusted to any desired size within its compass in the following manner:

Loosen the screws which hold -the cutters B and B', and turn the screw b to the-right or left, as expansion or contraction may be desired and the slide D, moving in its place, will, by reason of the tongue a. in the groove c, cause the cutters to move in a direction opposite to each other, the tongues, upon each side of the slide D, being of opposite inclination, and the drill4 endv of thedrill, and, while it permits the screw to tuin easily, prevents it'from coming out.

What I claim as my invention, anddesire to secure v by Letters Patent, is-

The combination of the tongued slide D with the screw b and cutters B and B', the whole constructed and arranged substantially as described, for the purposes specified.

JEREMIAH L. SAYLES. Witnesses:

G. B. Bnnnows, W. B. VINCENT. 

